@jaewonhong Sorry to hear you've encountered problems.
Judging from the error messages, the installation location of your com.esotericsoftware.spine.urp-shaders package is completely off, it seems to be located in Assets/Resources/URP/Shader/Spine:
Couldn't open include file 'Packages/com.esotericsoftware.spine.urp-shaders/Shaders/Include/SpineCoreShaders/Spine-Common.cginc'.
at Assets/Resources/URP/Shader/Spine/Include/SpineCoreShaders/ShaderShared.cginc(10)
This does not follow the original required package structure at all, being Packages/com.esotericsoftware.spine.urp-shaders/Shaders/Include. Did you move the package files around after installation? If so, please note that this is not supported, as include files are required to be referenced via Packages/com.esotericsoftware.spine.urp-shaders. If you place the Spine URP shaders package directly in <project root>/Packages/ or import it via Add package from git URL.. from outside your Assets directory, everything should be located correctly out of the box and can be referenced via Packages/com.esotericsoftware.spine.urp-shaders.
If you really need to move the files to a completely different structure, you would need to adjust the #include "path/to/include" statements in any Spine URP shader files accordingly.